diff --git a/central_backend/src/energy/engine.rs b/central_backend/src/energy/engine.rs
index f186210..6e3e3f8 100644
--- a/central_backend/src/energy/engine.rs
+++ b/central_backend/src/energy/engine.rs
@@ -58,13 +58,52 @@ impl EnergyEngine {
     }
 
     pub fn refresh(&mut self, curr_consumption: EnergyConsumption, devices: &[Device]) {
-        // TODO : force creation of missing relays state
+        // Force creation of missing relays state
+        for d in devices {
+            for r in &d.relays {
+                // Requesting relay state is enough to trigger relay creation
+                self.relay_state(r.id);
+            }
+        }
 
-        let new_relays_state = self.relays_state.clone();
+        let mut new_relays_state = self.relays_state.clone();
 
-        // TODO Forcefully turn off relays that belongs to offline devices
+        // Forcefully turn off relays that belongs to offline devices
+        for d in devices {
+            if !self.device_state(&d.id).is_online() {
+                for r in &d.relays {
+                    new_relays_state.get_mut(&r.id).unwrap().on = false;
+                }
+            }
+        }
 
-        // TODO Forcefully turn off relays with dependency conflicts
+        // Forcefully turn off relays with missing dependency
+        loop {
+            let mut changed = false;
+
+            for d in devices {
+                if !self.device_state(&d.id).is_online() {
+                    for r in &d.relays {
+                        if !new_relays_state.get(&r.id).unwrap().on {
+                            continue;
+                        }
+
+                        // Check if any dependency of relay is off
+                        if r.depends_on
+                            .iter()
+                            .any(|d| !new_relays_state.get(d).unwrap().on)
+                        {
+                            new_relays_state.get_mut(&r.id).unwrap().on = false;
+                            changed = true;
+                        }
+                    }
+                }
+            }
+
+            if !changed {
+                break;
+            }
+        }
 
         // TODO Virtually turn off all relays that can be stopped